A Z2xZ2 standard model

We present a Z_2 x Z_2 orbifold compactification of the E_8 x E_8 heterotic string which gives rise to the exact chiral MSSM spectrum. The GUT breaking SU(5) to SU(3)_C x SU(2)_L x U(1)_Y is realized by modding out a freely acting symmetry. This ensures precision gauge coupling unification. Further,...

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Detalles Bibliográficos
Autores principales: Blaszczyk, Michael, Nibbelink, Stefan Groot, Ratz, Michael, Ruehle, Fabian, Trapletti, Michele, Vaudrevange, Patrick K S
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: 2009
Materias:
Particle Physics - Theory
Acceso en línea:http://cds.cern.ch/record/1225128
Descripción
Sumario:We present a Z_2 x Z_2 orbifold compactification of the E_8 x E_8 heterotic string which gives rise to the exact chiral MSSM spectrum. The GUT breaking SU(5) to SU(3)_C x SU(2)_L x U(1)_Y is realized by modding out a freely acting symmetry. This ensures precision gauge coupling unification. Further, it allows us to break the GUT group without switching on flux in hypercharge direction, such that the standard model gauge bosons can remain massless when the orbifold singularities are blown up. The model has vacuum configurations with matter parity, a large top Yukawa coupling and other phenomenologically appealing features.

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